2023 TOYOTA PRIUS PLUG-IN HYBRID stop start

952-1. Plug-in hybrid system
2
Plug-in hybrid system
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
■Conditions in which the gasoline engine may not stop
The gasoline engine starts and stops automatically. However, it may not stop
automatically in the following conditions
*:
●During gasoline engine warm-up
●During hybrid battery (traction battery) charging
●When the temperature of the hybrid battery (traction battery) is high or low
●When the windshield defogger switch is pressed. (P. 527)
*: Depending on the circumstances, the gasoline engine may also not stop
automatically in situations other than those above.
■If the vehicle is not used for a long time
●The 12-volt battery may discharge. In this event, charge the 12-volt battery.
(P. 594)
In order to prevent the hybrid battery (traction battery) from becoming
extremely low in charge, charge the hybrid battery (traction battery) from
external power source or start the hybrid system at least once every 2 or 3
months, and turn the power switch off after the gasoline engine has
stopped automatically. (If the gasoline engine does not start up even after
approximately 10 seconds have passed since the “READY” indicator came
on, the power switch can be turned to off without any further action.)
●When the vehicle is left with the charging cable connected, the electricity
consumption amount of the 12-volt battery increases due to controls, such
as the system checking, operating. When the charging cable is not needed,
immediately remove it from the vehicle.
●For vehicles with solar charging system, please refer to P. 181.

962-1. Plug-in hybrid system
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
■Sounds and vibrations specific to a hybrid vehicle
There may be no engine sound or vibration even though the vehicle is able to
move with the “READY” indicator is illuminated. For safety, apply the parking
brake and make sure to shift the shift position to P when parked.
The following sounds or vibrations may occur when the hybrid system is
operating and are not a malfunction.
●Motor sounds may be heard from the engine compartment.
●Sounds may be heard from the hybrid battery (traction battery) when the
hybrid system starts or stops.
●Relay operating sounds such as a snap or soft clank will be emitted from the
hybrid battery (traction battery), behind the rear seats, when the hybrid sys-
tem is started or stopped.
●Sounds from the hybrid system may be heard when the back door is open.
●Sounds may be heard from the transmission when the gasoline engine
starts or stops, when driving at low speeds, or during idling.
●Engine sounds may be heard when accelerating sharply.
●Sounds may be heard due to regenerative braking when the brake pedal is
depressed or as the accelerator pedal is released.
●Vibration may be felt when the gasoline engine starts or stops.
●Cooling fan sounds may be heard from the air intake vents. (P. 99)
■Vehicle proximity notification system
In the following cases, the vehicle proximity notification system may be diffi-
cult for surrounding people to hear.
●In very noisy areas
●In the wind or the rain
Also, as the vehicle proximity notification system is installed on the front of
the vehicle, it may be more difficult to hear from the rear of the vehicle com-
pared to the front.
■When “Proximity Notification System Malfunction Visit Your Dealer” is
displayed on the multi-information display
The vehicle proximity notification system may be malfunctioning. Have the
vehicle inspected by any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer immediately.
■Maintenance, repair, recycling, and disposal
Contact any authorized Toyota retailer or Toyota authorized repairer, or any
reliable repairer regarding maintenance, repair, recycling and disposal. Do
not dispose of the vehicle yourself.

992-1. Plug-in hybrid system
2
Plug-in hybrid system
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
There are air intake vents on both
sides of the rear seatback for the
purpose of cooling the hybrid bat-
tery (traction battery). If the vents
are blocked, charging/discharg-
ing of the hybrid battery (traction
battery) may become limited.
When a certain level of impact is detected by the impact sensor, the
emergency shut off system blocks off the high voltage current and
stops the fuel pump to minimize the risk of electrocution and fuel leak-
age. If the emergency shut off system activates, your vehicle will not
restart. To restart the hybrid system, contact any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer.
A message is automatically displayed when a malfunction occurs in
the hybrid system or an improper operation is attempted.
If a warning message is shown on
the multi-information display, read
the message and follow the
instructions.
Hybrid battery (traction battery) air vents
Emergency shut off system
Hybrid warning message

1452-2. Charging
2
Plug-in hybrid system
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
■“Traction Battery Cooler” (if equipped)
When the hybrid battery (traction battery) is hot, this function pro-
tects it by using the vehicle air conditioning to cool it before
charging is carried out.
When the hybrid battery (trac-
tion battery) is above a certain
temperature and the power
switch is turned off, a check
screen is displayed on the
multi-information display that
indicates whether “Traction Bat-
tery Cooler” is implemented.
When “No” is selected, the hybrid battery (traction battery) cooling sys-
tem does not operate.
■“Traction Battery Heater”
●“Traction Battery Heater” may operate when charging is not being per-
formed.
●When “Traction Battery Heater” is operating, the charging indicator illumi-
nates.
●When “Traction Battery Heater” is operating during charging, the charging
time may be longer than normal.
●If the outside temperature becomes high while “Traction Battery Heater” is
operating, charging may complete earlier than the “Departure” time set.
(P. 166)
●“Traction Battery Heater” can be turned on and off in the “Vehicle Settings”
settings on the multi-information display. (P. 726)
●“Traction Battery Heater” may operate even when the hybrid battery (trac-
tion battery) is fully charged depending on the temperature of the hybrid bat-
tery (traction battery).
• The remaining charge of the hybrid battery (traction battery) decreases
when “Traction Battery Heater” operates. The charging operation may
start again to charge the hybrid battery (traction battery).
• “Charging Stopped Due to Pulled Charging Connector” may be shown
when the charging connector is removed while recharging. (P. 187)

1462-2. Charging
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
■“Traction Battery Cooler” (if equipped)
●When the hybrid battery (traction battery) is above a certain temperature
and the power switch is turned off, a check screen is displayed on the multi-
information display that indicates whether “Traction Battery Cooler” is imple-
mented. Approximately 5 minutes after selecting “Yes” on this screen, sys-
tem operation becomes possible.
●When charging starts, “Traction Battery Cooler” only operates if the hybrid
battery (traction battery) temperature is hot.
●The charging indicator is illuminated while “Traction Battery Cooler” is on
standby or operating.
●“Traction Battery Cooler” is implemented for a maximum of approximately
30 minutes. However, when the “Departure” time is set (P. 166) and there
is not sufficient time between the current time and the time that charging will
complete, “Traction Battery Cooler” operation time may become shorter.
●When there is a small amount of remaining charge in the hybrid battery
(traction battery), even if the hybrid battery (traction battery) is hot, “Traction
Battery Cooler” may not be implemented.
●When the following operations are performed while “Traction Battery Cooler”
is operating, the hybrid battery (traction battery) cooling operation stops.
• A door is opened
• The hood is opened
• The power switch is turned to any mode other than off
• The alarm operates (if equipped) (P. 7 6 )
• The shift position is changed to any position other than P
• The Remote Air Conditioning System is operated (P. 535)
• “Charge Now” is implemented (P. 167)
• The amount of remaining charge in the hybrid battery (traction battery) is
below a certain amount
●When the power switch is turned off, a check screen is displayed on the
multi-information display that indicates whether “Traction Battery Cooler” is
implemented. This check screen can be turned on and off in the “Meter Cus-
tomize” settings on the multi-information display (P. 250). However, when
the check screen is set to “Off”, “Traction Battery Cooler” is no longer oper-
ates.
●“Traction Battery Cooler” uses the power of the hybrid battery (traction bat-
tery) and external power source.
• While “Traction Battery Cooler” is operating, the amount of the remaining
charge of the hybrid battery (traction battery) increases and decreases in
a certain range, and does not increase as in normal charging.
• The operation of “Traction Battery Cooler” is recognized as charging by a
charger. The charger that calculates the fee according to charging time
causes a charging fee.

1492-2. Charging
2
Plug-in hybrid system
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
Information related to charging can be displayed and checked on the
multi-information display.
■While charging
When any door is opened
during charging, the current
charging condition and remain-
ing time until charging is com-
plete can be checked.
■After charging is complete
After charging is complete, the
first time that the hybrid system
is started, a message detailing
the results of the charging is
displayed. Also, a message is
displayed if an operation that
stops charging is performed or
a situation where charging can-
not be performed occurs.
When a message is displayed, follow the instructions displayed on the
screen. (P. 187)
■Combination meter display during charging
If approximately 100 seconds elapse after the power switch is turned to ON
mode during charging, the power switch will automatically turn off and the dis-
play will disappear.
Checking information related to charging

1512-2. Charging
2
Plug-in hybrid system
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
Before charging, always check the following items.
●The parking brake is applied. (P. 336)
●The headlights are switched off or set to AUTO, and lights such as
the emergency flashers and interior lights etc. are switched off.
If these light switches are turned ON, then these features will consume
electricity, and charging time will increase.
●The power switch is off. (P. 323)
Before charging, make sure that each part of the charging cable is in
good condition. (P. 126)
■Safety functions
●The hybrid system will not start while the charging cable is attached to the
vehicle, even if the power switch is operated.
●If the charging cable is connected while the “READY” indicator is illumi-
nated, the hybrid system will stop automatically and driving will not be possi-
ble.
●When the charging cable is connected to the vehicle, the shift position can-
not be changed from P to another position.
■During charging
The followings occur, however, it does not indicate a malfunction.
●The charging starting time may differ depending on the state of the vehicle.
●During charging, the sound of the fan may be heard from the onboard trac-
tion battery charger cooling air intake vents. (P. 154)
●During and after charging, the rear seat and its surrounding area in which
the onboard traction battery charger is installed may get warm.
Confirm the following before charging
Inspecting the charging cable

1772-2. Charging
2
Plug-in hybrid system
Prius Plug-in Hybrid_OM_OM47F38E_(EE)
■When “Next Charging Event” is changed while charging
● When the charging mode is “Departure”, the current charging is interrupted
or continued depending on the remaining time until the charging is com-
pleted.
● When the charging mode is “Start”, the current charging is interrupted, the
next charging will start at the set time.
■ When the power switch is turned off
It is possible to check the next charge
schedule (“Next Charging Event”) by oper-
ating or of the meter control
switches while the power switch is turned
off and the “Ending” screen*1 ( P. 198) is
displayed.*2
*1: The “Ending” screen may not be dis-
played during charging.
*2: When the power switch is turned off, the “Next Charging Event” confir-
mation screen may be displayed.
WARNING
■ Cautions while performing the setting operation
When performing the setting operation while the hybrid system is operated,
ensure that the vehicle is parked in a place with adequate ventilation. In a
closed area such as a garage, exhaust gases including harmful carbon
monoxide (CO) may collect and enter the vehicle. This may lead to death or
a serious health hazard.
NOTICE
■ While performing the setting operation
When performing the setting operation while the hybrid system is stopped,
be careful that the 12-volt battery will not be discharged.